My Grandma has a dark red "Whispertone"
It is basically a B.O.L Progressive. She bought it for about $250 in late 2004. It still has the original HEPA filter in it. (It gets used a couple times a month, at most.) It is a nice vacuum, and the cen-tec cleans carpets beautifully. But, my grandmother still likes the early 80's powermate that this replaced. She thought it was built better and easier to use (Which I can agree apon.) My other grandmother has the 3rd generation M.O.L Progressive in blue which she got as a christmas gift from all her kids in late 2009. She still has that one as well. My aunt and uncle later bought the same model, to replace their blue '02 progressive (which still ran but the powerhead was done for) about a year after that. My other aunt is soon to replace her orange progressive from about '05 with a new one, though I told her not to expect it to last another 10 years, like the old one. My other aunt bought a purple one in '11, and became fed up with it. Since she has mostly floors and some low pile carpet, I suggested a Miele. She bought a Titan in late '12 and is very happy with it. It's interesting, my dad's side are mostly canister people, whereas my mom and aunt are upright people. My aunt HATES canisters. I think my mom is a bit more lenient now, because of how well the Rainbow works.